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-   -   The Kuartlotron - keantoken's simple error-correction superbuffer (https://www.diyaudio.com/forums/analog-line-level/251413-kuartlotron-keantokens-simple-error-correction-superbuffer.html)

hkknudsen 28th November 2017 05:29 PM

Quote:

Originally Posted by keantoken (https://www.diyaudio.com/forums/analog-line-level/251413-kuartlotron-keantokens-simple-error-correction-superbuffer-post5254295.html#post5254295)
I would say go slightly above.

Thanks Kean, would you say the Kuartlotron is sensitive to variations in voltage? Is 9V significantly worse than 10V or is it barely detectable? Sorry if repeating myself:o

Asking as I've been a bit deluded by battery sellers; with lifepo4 only 9.6V nominal (should be possible to keep between 9.9 fully charged and 9.3) or 12.8V is possible

Destroyer OS 29th November 2017 01:03 AM

Keantoken said some people thought high voltage didn't sound as good. I forget what mine is at but it's well above 10v, and there are zero issues with it.

I personally doubt you can tell the difference. If you understand how the circuit works to some degree you start to see how the DC voltage really just needs to be enough to divide into 4ish and be at the vrms output of the source; and how the input and output of the signal doesn't really care what the DC voltage is at all. The claim is sonic attributes, not function, with increasing voltage.

I'd go with a 12/12.8v battery personally. Batteries often insta-sag to a little less voltage if they are not rather big compared to the current demand, and I wouldn't want to have my buffer clipping after playing for a short time if I had a hot source.

keantoken 29th November 2017 04:33 AM

9.3-9.9 is close enough to 10V, I would just use that and take advantage of the longer battery life.

hkknudsen 29th November 2017 09:37 PM

Quote:

Originally Posted by keantoken (https://www.diyaudio.com/forums/analog-line-level/251413-kuartlotron-keantokens-simple-error-correction-superbuffer-post5259467.html#post5259467)
9.3-9.9 is close enough to 10V, I would just use that and take advantage of the longer battery life.

Thanks a lot both. I think I will go for the flexible solution with single batteries + bms'es instead of finished packages, that way I can change the voltage by adding/removing a battery if I want. Probably something like 6pcs of 32650, should be dimensioned on the very generous side and provide power for hundreds of hours without the regulators. Will let know how it goes. Destroyer are you saying that the voltage/4 just needs to be above the source's output? My output is 2.1Vrms, so I hope it'll be fine

Destroyer OS 29th November 2017 11:05 PM

That would be the ideal, but I don't think anyone has noticed a problem. The circuit eats some voltage too, not just the division.

hkknudsen 20th December 2017 02:25 PM

Absolutely loving the Kuartlotron. However my amp already has DC blocking caps, so I guess I could short the output capacitors in the K. But - which ones are that again?;-)

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RCruz 20th December 2017 04:03 PM

Quote:

Originally Posted by hkknudsen (https://www.diyaudio.com/forums/analog-line-level/251413-kuartlotron-keantokens-simple-error-correction-superbuffer-post5282273.html#post5282273)
Absolutely loving the Kuartlotron. However my amp already has DC blocking caps, so I guess I could short the output capacitors in the K. But - which ones are that again?;-)

An externally hosted image should be here but it no longer works. Please upload images instead of linking to them to prevent this.

there are no DC blocking caps in this buffer

hkknudsen 20th December 2017 04:23 PM

Quote:

Originally Posted by RCruz (https://www.diyaudio.com/forums/analog-line-level/251413-kuartlotron-keantokens-simple-error-correction-superbuffer-post5282349.html#post5282349)
there are no DC blocking caps in this buffer

Thanks Ricardo, I must have misunderstood a post in the thread at some point. But guess it was a good decision to ask before I shorted them then :o

keantoken 3rd January 2018 02:39 AM

Some of you may have noticed that the transistors in the Mouser BOM have changed to OnSemi. This is because Fairchild was acquired by OnSemi and the Fairchild listings were renamed to OnSemi. It is highly probable they are still the Fairchild parts, just under new branding.

If anyone has trouble, let me know.

darbost 10th January 2018 01:50 PM

Hi
I just finished assemble a pair of boards and now im setting the trimpots according to instruction. First step I managed to get 5v at TP by adjusting R5. But I have trouble on the second step. I cant get a steady 0V on the input. What i mean by steady is when adjust the dc trim i can make it 0V but after that it will go down to -0.1, -0.2, -0.3 and so on until -2.1mV where i gave up waiting for it. Output offset is about 10mV.
I can get 0V on output but on the input it will be wayoff from 0V. Could someone please tell me what i have done wrong?
All parts are according to BOM, soldering joints are ok, caps polarity is also ok. Powered them with a small smps with an output +11.94v and -12.15v.


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